Electrodeposited reamer tool

Abstract

The present invention relates to an electrodeposited reamer tool (1) for use in precision bore processing. In this electroplated reamer tool (1), a work processing portion (3) in a reamer body is constituted by a finishing portion (4) having a cylindrical outer peripheral surface and a cutting portion (5) provided on the distal end side of the finishing portion (4) and having a tapered configuration, and abrasive grains (6) are electrodeposited on the outer peripheral surfaces of the finishing portion (4) and the cutting portion (5). In the electrodeposited reamer tool (1) is inserted into a prepared hole provided in a work, the prepared hole is enlarged by the cutting portion (5), and the inner surface of the bore is finished by the finishing portion (4). Accordingly, it is possible to form a precision bore of a predetermined inner diameter in a work without preprocessing the prepared hole with precision.

We claim: 
     
       1. An electrodeposited reamer tool characterized by: a finishing portion having a cylindrical outer peripheral surface; and   a cutting portion provided on an end side of said finishing portion, an outer peripheral surface in an axial cross section of said cutting portion being curved so as to have a tapered configuration,   wherein abrasive grains are electrodeposited on said outer peripheral surface of said finishing portion and said outer peripheral surface of said cutting portion, the abrasive grains electrodeposited on said finishing portion are being trued; and   wherein abrasive grains having a grain size greater than that of said abrasive grains electrodeposited on said outer peripheral surface of said finishing portion are electrodeposited on at least an end portion of said outer peripheral surface of said cutting portion.   
     
     
       2. An electrodeposited reamer tool according to claim 1, wherein said cutting portion is provided with a ceramic coating. 
     
     
       3. An electrodeposited reamer tool according to claim 1, wherein a plurality of notches extending along a central axis of rotation are formed on said outer peripheral surfaces of said finishing portion and said cutting portion. 
     
     
       4. An electrodeposited reamer tool according to claim 1, wherein there are provided an oil supplying passage extending along a central axis of rotation and an oil hole communicating between said oil passage and said outer peripheral surface of said cutting portion. 
     
     
       5. An electrodeposited reamer tool according to claim 4, wherein said oil hole is provided in such a manner as to extend by being inclined diagonally toward the tip with respect to said central axis of rotation. 
     
     
       6. An electrodeposited reamer tool according to claim 4, wherein an oil reservoir in which said oil hole is open is formed on said outer peripheral surface of said cutting portion. 
     
     
       7. An electrodeposited reamer tool according to claim 6, wherein said oil hole is formed and a length of said oil reservoir are determined by conditions including a diameter of a prepared hole in a work, a finished diameter, an allowance for tool withdrawal, and a radius of a tool tip.